Typewriting machine



Mar. 13, v1923.

Kl A. LEHMANN TYPEWRITING MACHINE 'F11ed Jan. 14 1321 4 sheets-sheet 1Nm ma@ A l Mar. 13, 1923.

K. A. LEHMANN TYPEWRITING MACHINE 4 sheets-sheet Elled Jan. 14, 1921 U/\MHH. UHU. mf- I .Hm m

Filed Jan. 14, 1921 4 sheets-sheet' 5 Z ,v4 n' Patented Mar. 13, i923.

'narran stares earner er' tiran-i rica.

KAEL AUGUST LEHMANN, E EssEN, GERMANY, AssIGNoR rro FRIED. Kiwrr AKTIEN-GESELLSCHAFT, OF ESSEN-ON-THE-RUHR, GERMANY.

TYPEWRITING MACHINE.'

Application led January 14, 1921. Serial No. 437,313.

To all whom it may conce/rn.'

Be it known that I, KARL AUGUST LEH- MANN, residing at Essen, Germany. acitizen of the German Republic, have invented-a certain new and usefulImprovement in Typewriting Machines, of which 'the following is aspecification.

My invention relates to typewriting machines having a bar which in itsoperative lo position servestol retain the platen in its 4 upperposition. In typewriting machines of this particular type, which areknown tothe art as typewriting machines having autormatic case-shiftrelease mechanism, the retaining bar can only be released and the platenreturned, after the shifting has been effected and the platen beenlocked, by depressing a type-key. This, however, embodies a drawback,inasmuch as it may happen that after the platen has been shifted,

it may not prove desirable that the particular type.entering intoconsideration when the platen is in this position shall effect a print.This,however, would be `the case in the event of anaccidental shiftingof the platen. It is'the object of my present invention to remedy thisdefect.

In the annexed drawing two constructional forms of the subject matterofv'myv invention are illustrated by way of example. In this 'drawing-Fig. l shows a cross section of the first form of-execution, withcertain parts broken' away,

Fig.' 2 shows a section on line 2 2 in Fig. l, looking from the left,

F ig..` -3 shows a section on lineB- in l, seen from the top,

A Fig. 4 shows across section of the second form o-f execution, withcertain parts broken away,

Fig. 5 shows a section on line 5-5 4, looking from the left, 'and llFig. 6 shows a section on line 6-6 inFig. 4, seen-from the top.

Referring toffthese drawings, within the frame A, of the typewriting'machine there is arranged to rock about `pivots al, a frameshapedspacing lever B carrying akey (il (Fig. 3) and an arm Z22 communicatingwith the feed mechanism (not shown) of the .machine ,A spring C (Figs.Vl and 3) attached to the lever B tends to rotate it in the direction ofthe arrow m (Fig. l).V On the pivots al there is further mounted' a caseFig.

in Fig.

shift lever D, carrying two keys il 'disposed for their part at eitherside of the key t1 and acted upon by a powerful spring it" whichlikewise tends to turn this leverin the direction of the arrow At the .iend of the case shift lever D, disposed toward the rear wall ofthemachine, there `is articulated a lifting lever F. This latter isadapted to move by means of a bolt f1' within two oppositely disposedslots as formed ina stationary part a2 of themachine, and carries at itsfree endv a roller 7g2-bearing up from below against a rod g1 rigidlyconnectedto the bearings (not shown) of the paper-roller G. There islastly mounted on the pivots al, so asto rock, altwo`-armed frame-shapedlever H. This lever His provided with two extensions bl, each of `'whichbears two stops h2 and h3 which are all located in the plane ofoscillation of the case shift lever D. The stop 7a2 acting under theimpulse of a spring J, whichengages the llevers. D and I-I and which `isweaker `than lthe spring E, bears up froml below against the case shiftlever D. The stop ha isdis'- -80 posed for acertain measure above thecase shift lever D. On thev lever thereis linked, to either side ofthespacingkeyf bl, a lever 7a4 having akey h5; the said vke'ys'h5 beinglocated at the particular point` of the machine, where inthe case'ofmost ofthe typewriting machines havingno automatic case shift releasemechanism, the keys-of the case shift `lever are disposed'. vEach ofthelevers h4 bears up by meansof a projection .90 h6 and under theimpulseof a spring/L7 against a stop las of thelever H. lA second` stopb9 xed tothev lever 4H and serving to limit a rotation of the vlever h4counter to the action of the spring if, lies-within the 195 path of theprojection he( The axis of rotation of the lever tfis disposed insuchwise that when the key7 h5 is normally depressed, the pressureexerted 'by the finger `will tend to turn the lever-lti in the sense` inwhich the springfih. acts. To each of the levers h4 there is arranged` abent projection h1 vadapted to engage a stationarystop plate a"as soonas the' lever' comes to bear up with-its projection'ltgaga-inst the stopIt. 1,105 At the end of the lever H, disposed toward the rear wall ofthe machine, thereis articulated'a U-shaped arm having'twooppositely'disposed' slots` khvwhich'a guide bolt f3 fixed to thelifting lever .Fgis adapted 11'0 to engage. A bar N, adapted to rockabout the bolt f1, bears up under the impulse o't a spring M against thecross piece 7a2 of the arml by means of an extension al. rllhislatterhas a projection n2 extendinginto the path of the cross piece 7a2.The bar N is moreover provided with another-projection n3 having a bevelsurface n4, and within the path ot which a cross piece a5of'thestationary part a2 of the machine is disposed` Finally the bar Nis provided with'an ei;- tension 'a5 supporting a roller a6. rllhisroller lies within the path oi a plate? which, each time a type-key isdepressed, is movedlin a horizontal direction and=is thus enabledl toassume theposition shown in .dash-and-dot lines in Fig. l.

ln the position ot the various parts ot'the machine, as illustrated, andwhich is the normal position, when thetype-keys (not shown) which b'earboth small and' capital letters, are depressed, then small letters cometo be written. 'It now, however, a capital letteristo be writtenAt'ollowed by a small letter., then primarily one oit thc keys all isdepressedcounter to the action of the spring E; the lever H being at thesame time taken' along by'interventio'n of .the pin 7b2. As a resultboth the arm K, the lifting ylever F along'with the bar N and thepaperroller G come t'obe raised. Simultaneously, the proje'otiona3(while'the bevel surface a4 2glides along the edge o" the cross piecea5) is forced sideways and engages, at the termination of the motioneffected by the case shiftle'ver D,"under the action Aof 'the spring Mthe.' cross piece c5. kUpon the' key A.Z1 being released, the liftinglever F and therewith also 'the' paper-roller G remain in their'uppermost position. It hereupon a type key be depressed, then a capitalletter will come to be'written. At the Sametime, however, the pla-te isshifted, at the conclusion ot the lifting' motion of the type-key, intothe posit'ionshown in dash-and-dot linesin Fig. l. In so doing, thepl'atel3 stri-kes against the' roller as and turns the bar N counter tothe action ofthe springM, so that the projection n3 vwill be thrust fromthe cross piece n" and the several parts will thereupon return intotheir initial position by the aid oit the springs M, E and J. 0n' thenext typekey being` now depressed, a small letter will consequently cometo bev written.`

In' the course of the operations just described, the device forming thesubject mattr of my invention does not as yet ent-er'into action'. Thiswill. however, be the case as soon as the paper-roller Ghas beenaccidentally shifted into the uppermost position by the depression otthe key 071, and when a type-key is n'ot toi be depressed for makina` avprint. lIn this contingency, the paperroller (t isreturned into itsnormal position byl` depressingone of the keys h5. For when iaaaaiidepressing` one ot these keys, the arm K is shifted, relatively to thelifting lever F, into the position indicated in dasli-and-dot lines inFig. l and the projection n2 is at the same time forced by the crosspiece 702 of the arm EL out of the path ot the cross piece 7a2, so thatthe projection n3 is thrust from the cross piece ai. This latter actiontakes place only tor an instant; still it z(generally suffices forenabling the lifting lever F and consequently the paper-roller G to belowered. The key 7tj is at once released alter it has been depressed,whereupon t-he several `parts return into their initial positionprovided p the bar N has been properly released: ln Athis contingency,the springv J turns the lever H in the direction ot the arrow relativelyto the rase shitt lever D. Vilhile the levers D and H are thus turnedrelatively to cach other, the vcross piece 702 once again forces theprojection n? aside so that, in the event oit the bar N not having` asyet been released, such release will now be effected;

ln case several capital let-ters are to'be typed oli' in succession,then the key is tir-,5t depressed and the lever 71/L thereupon turnedcounter' to the action of the spring 71,7 for such an' extent until theprojection 71,10 will come to engage the stationary stop plate a?l andthus prevent the key 7t5 from returning. As the key; h5 is depressed,the arm K lirst of all shifts into the positionshown in dash-and-dotlines; the bar N at thesame time executing a' rocking' motion owingA tothe action of the cross piece'7c2 upon the projection n2. As soon; asthe arm K has attained the position shown` in' dash-and-dot lines, thepin 71,3 abuts againstv the caseshitt lever D and takes it along:v As` aresult,

howeventhe nacer-roller Gf is raised and reason that the projection71,10 prevents the lever H and therewith likewise thecase shift lever D,from. returning. If now a type-key be depressed'` then the resulting4displacement oi the plate P'will not eli'ect a lowering of the paper-roller, but this roller will'rather only return into its normalposition', atter the lever 72,4 hasv been rotated counter-clockwise and,in so doing'. cause the projection h1 to be thrust from the stop plateat. w For as soon as' this has been done, thev spring J turns the leverH in the directionfin'dicated by the arrow x relatively to' the' caseshift lever D, and the bar N is released in the manner previously setforth.

ln the described torm ot execution it is. however, not absolutelyimpossible that, upon the paper-roller G having'v beenv accidentallyshifted into its upper position, the bar N will tail to be released bydepressing the key 71,5. In the modified form ot' execution to bepresently explained, such a' tailure to act on the part of the releasingmechanism is rendered ii'npossible. This modi- CJI fied construction,which illustrated in Figs. '4l to 6, is substantially the same, with theexception of the releasing device, as the form disclosed in Figs. l to3, thatv reference may also be made to these last-mentioned figures. Inthis modification the lever 7a4 carrying the projection 7t10 is adaptedto engage a stop ledge a formed on the edge of the frame A. of Athemachine. The lever H comprisestwo parts, interconnected by link bolts7i11, ofwhich the one part, H12 located toward the rear end of themachine is articulated to the case shiftlever by inea-ns of two bolts Q,and, at its cranked portion 71,13, by means of abolt R coaxial to thebolts Q. The cranked portion 7t13vis bent up obliquely atits extremityand forms a cross piece 72,14. Act-ing under the impulse of a spring M,the projection n1 of the bar N bears up against this cross piece. Thepart H12 of the lever is acted upon by a helical spring T, one end ofwhich engages the underside of a pin 7t15 mounted on the part 71,13 ofthe lever, whereas its other end engages the underside of the case shiftlever D. The helical spring T is weaker than the spring E. Acting underthe impulse of the helical spring T, y below against two stops cl2 fixedto thereversing lever yD. This latter is, in addition, provided with twosupplementary stop pins (73,' these latter'being disposed for a certainextent below the lever H. The lifting lever F is supported by the boltR.

If it be desired to type by means of the machine illustrated in4 Figs. 4'to 6, first a single capital letter and thereupon a small letter, then,even as in the case first explained, one of the keys Z1 is firstdepressed. In so doing the lever H comes to be taken along by theintervention of the stop cl2. so that the parts connected with thelevers D and H will not come to altertheir position relatively to eachother. As a result the paper-roller G is raised and retained by the barN in this upraised position.. Upon a type-key being hereupon depressed,a capital letter is caused to be written, after which the bar N isautomatically released; so that, consequently, the several parts returninto their initial position directly the said capital letter has beentyped. y

In the event, however, of the paper-roller G having been accidentallyraised, then one of the keys h5 is depressed. In so doing, the part H12of the lever turns about the bolts Q and R, the position of which hasnot been affected and the cross piece 7L14 therefore moves in thedirection denoted row y (Fig. 4) and effects the release of the bar N.As a result, released, the paper-roller G comes to be lowered and theseveral parts, impelled by their own weight and by the action of thesprings M, T and E, .return into their normal posithe lleverl Hbears upfrom `by the arafter the key 7t5 has been intervention ofthe helicalspringrsT and thus allows the bar `N to assumel its opera-- tiveposition. However, in this vvery instant,- the paper-roller (i has sothat the 'release action is now carriedout with absolute reliability, of'successfi already descended If several capital letters are to` be typedi l .in succession, then' one of the 'keyshis lirstdepressed and thelever 7b4 rotated counter to the that after the key'47z.5 has beenreleased,a` 're` turn motion of by the projection blo'and the ledge as.As the key 7t5 is ,being-depressed, the position of the case shift leverD does not undergo any change'for the, present, and the part I 12 of the'lever H may therefore be rotated relatively to the lever D in thedirection de-4 noted by the arrow g/ and the bar N therebyl be shiftedinto an inoperative position. After that,'a`nd as the'key 71.5continues' to descend, the case shift leverD comes to be taken along bythe intervention ofthe stop C73, while the paper-roller Gris raised by'the aid of the lifting lever F.` The paper-roller will only be enabledto descend again on` the lever 7t1 being turned counter-clock` wise andwhenthe projection 7t1 has been thrust from the ledge a6.

Claims:

l. In a typevvritingl machine the combination with a movable platen,anda case shift mechanism of a locking member for retaining' the and acasey shift release mechanism funcyaction of the fspring 767,so'-

the lever Hl will be prevented 1 -v platenfin its raised positiontioning when moved relatively to said case ber whereby said case shiftand release mechanisms may be operated simultaneously or said releasemechanism moved relatively to said case shift mechanism displace saidlocking member and thereafter to engage said case shift mechanism.

and caused toy gaging said case shift and said locking mem- 3. In atypewriting machine a platen, ra i case shift lever, a locking mechanismfor .member connected to and shift lever.

retaining said platen in its shifted position, a hey operated releasinglever7 a releasing operated by said releasing le 7er and adapted toengage said locking `member te ine-ve the same to inoperative positionnpon a relative movement between said releasing and case shi-lt levers.land projections formed. on said releasing lever in the path oi' saidcase shift lever, whereby movement et said releasing lever Willirstdisplace said locking men'iber and thereafter canse a movement o' saidcase Writing machine a platen, a case shift lever, a locking;- memberfor retaining the platen in its shittedposition, a hey operatedreleasing lever, a releasing member ,releasing level; said lockingmember being provided with a projection extendinginto 'the path of saidreleasing member; the releasing member being` displaeeable at rightangles thereto whereby said releasing member Will. transiently shiftsaid lockingv member into an inoperative position upon a relativemovement between said case shift and releasing leversand means forcoupling said ease shittand releasing levers whereby they ln a typeether, and projections carried connected to and Operated by said yinseam may be actuated simultaneously or said rea leasing lever movedrelativelyto said case shift lever. I y

5. ln atypewriter a shiftable platen, a case shift mechanism, alockingmember `or locking said platen in its raised position, a easeshiit release mechanism Afunctioning when moved relatively to said caseshift mechanisim said case shift and release mechanisms being disposedadjacent one anby said release mechanism and engaging lsaid case shiftmechanism whereby may be operated sin'iultaneously or said releasemechanism moved relatively to said case sliilt mechanisms7 the movementof said release mechanism relative to said. case shift mechanism causinga displacement of said locking member to permit said platen to return toits lower position.

The foregoing specification signed at Essen, Germany, this 22nd day otllovember`r l920.

anni linensr LEHMANN. I

ln presence 0fi Hans Gorrsi/IANN, JOHANN DEGKERS.

said mechanisms

